Hi Folks,
On my K 100 RS I wanted to put a simple volt indicator on the bike. Thinking it through and having spent a fair bit of time in the past talking with the incredible Professor Eric Laithwaite at Imperial College I knew I was not really interested in an actual value whilst riding just knowing it was "all right". I carry one of those really low cost small digital multimeters in the tool kit for troubleshooting if I were to have a problem. I bought a BackOFF voltage monitor from the friendly folks at Cyclegadgets
http://www.cyclegadgets.com/Products/product.asp?Item=BOVOLT

The device fits my needs since it does the following: -

• Flashing Green (Above 15V)
  
• Steady Green (12-15V)
  
• Steady Amber (11-12V)
  
• Steady Red (10-11V)
  
• Flashing Red (Below 10V)
  

If I were to get a warning it is real easy to jump off, put the bike on the centrestand and get the little multimeter out to check what the problem is.
Regards,
K-BIKE